on closer examination, as with almost every part of the body, it is a wonder of complexity. It has five layers—epithelium, Bowman’s membrane, stroma, Descemet’s membrane, and endothelium—laminated into a space just slightly over half a millimeter thick. In order to be transparent, it has a very modest blood supply—indeed, practically none. The part of the eye that has the most photoreceptors—that really does
